Charlieplexing ? It?s a Cylon-eyes and Not Related with Char

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First of all, do you know what this "Charlieplexing" is? It is an electronics techniques, which developed by Charlie Allen, a genius and talented engineer at Maxim.

According to Charlieplexing theory, it's involved minimizing the use of I/O pins on a microcontroller to drive a maximum number of LEDs. In addition, the n drive pins can be used to drive n digits with the n-1 segment. This also means, the n drives can be used to control the n²-n LEDs!

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